mutt: Fix documentation for DT_MAGIC types. (closes #3845)

[Brendan Cully]

changeset: 6659:52f48b083cc0
user:      Kevin McCarthy <ke...@8t8.us>
date:      Tue May 31 13:20:28 2016 -0700
link:      http://dev.mutt.org/hg/mutt/rev/52f48b083cc0

Fix documentation for DT_MAGIC types. (closes #3845)

With the rename of M_ to MUTT_, the documentation generator in
makedoc.c needed to be adjusted for the new prefix size.

Thanks to Damien Riegel for the suggested fix.

diffs (12 lines):

diff -r cd316a555bd7 -r 52f48b083cc0 doc/makedoc.c
--- a/doc/makedoc.c     Thu May 26 14:45:02 2016 -0700
+++ b/doc/makedoc.c     Tue May 31 13:20:28 2016 -0700
@@ -506,7 +506,7 @@
     case DT_MAGIC:
     {
       /* heuristic! */
-      strncpy (t, s + 2, l);
+      strncpy (t, s + 5, l);
       for (; *t; t++) *t = tolower ((unsigned char) *t);
       break;
     }